CrowTalk

Corvus cornix

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🗺 Regional sounds: Crow dialect varies between populations. Always note the location when saving — your recording contributes to local dialect research.
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🎵 Vocalisations
Social
Contact call
kraa… kraa (1–2 calls)
Soft, calm call to maintain contact with flock or partner. The most common call in everyday situations. Longer pauses between calls signal relaxation.
Food
Food call
kra-kra-kra (2–3 short)
Shorter, faster calls when food is found. Research shows crows deliberately keep food calls shorter to avoid attracting too many competitors (Pendergraft & Marzluff, 2019).
Alarm
Alarm call
KRA! KRA! KRA! (3 fast)
Three fast, loud calls when a raptor or other threat is detected. Universally understood by other crows. WARNING: May cause a permanent negative association if used against crows that don't know you.
Alarm
Mobbing
KRA-KRA-KRA-KRA-KRA (5+ calls)
Intense, repeated calls to rally the flock against a threat. Five or more calls mobilise the entire flock. Crows remember faces and can spread "warning" to others (Cornell Lab, 2012).
Regional
Territorial
KRAAAA (2 long, powerful)
Powerful, extended call to defend territory. Used mostly during breeding season. Shows clear variation between regional populations — an important sound for dialect research.
Social
Rattle / Click
klk-klk-klk (low frequency)
Low-frequency clicking or rattling sound. Used in close social contact, often between pairs. A sign of relaxed trust — a good sign if a crow rattles near you.
Juvenile
Juvenile call
high-pitched, uncertain
Young crows have a thinner, higher-pitched voice. Adult crows are usually tolerant of begging juveniles. Juvenile calls are regionally inconsistent — dialect develops during the first year of life.
Comfort
Content / Comfort call
kraa-kraa-kraa-kraa (4 soft)
Four soft, calm calls used in safe situations — resting, near a partner, or after successful feeding. Similar to contact call but with longer duration per call.
🔢 Call count
CountMeaningSituation
1Acknowledgement / attentionReply to contact, "I see you"
2Contact / greetingCalm presence, near partner
3Alarm — threatRaptor, unknown human
4Content / well-beingSafe situation, bonding
5+Mobbing — rally flockIntense threat, chasing raptor
2–3 shortFoodFood find, but kept sparse
2 longTerritorialTerritory defence, breeding season

Counting: A 2024 study in Science showed that crows mentally plan 1–4 calls before vocalising — one of the few documented forms of numerical planning in birds.

🐦 Body language
⬆️
Upright posture, feathers sleek
Alert or alarm behaviour. The crow is focused on a potential threat. Often combined with alarm calls.
⬇️
Hunched, ruffled feathers
Relaxed and calm state. Ruffled feathers = thermoregulation or relaxation. A good sign if the crow hunches near you.
🙇
Head-lowering (allopreening)
The crow lowers its head towards a partner for preening. A sign of deep trust and social bonding. Rare towards humans, but documented.
🍗
Flying towards you + wing flapping
Begging behaviour, common in juveniles towards parents. Towards humans = established relationship and expectation of food.
🎁
Leaving objects
Documented behaviour in crows that have formed close bonds with humans. Considered reciprocal gift-giving — the crow returns the favour for food received.
👁️
Direct eye contact + sideways posture
Crow eyes are on the sides of the head. Tilting to look directly with one eye = focus and curiosity. Avoiding eye contact = discomfort.
💬 Communicating with crows

Core principle: Crows are highly social and curious, but also cautious. Build trust gradually. A crow that trusts you will actively seek you out.

1
Establish a safe place
Visit the same spot at the same time each day. Leave food (walnuts, unsalted peanuts, soft food) without trying to interact. Let the crows observe you undisturbed for 1–2 weeks.
2
Start with contact calls
Once the crows are used to you: play a soft contact call (1–2 calls) via the app. Wait 30–60 seconds. If they respond or move closer — repeat. Never play alarm or mobbing at this stage.
3
Record responses
Record the crow's response directly in the app (Record tab). Note call count, character and behaviour in the journal. Patterns over time reveal whether you are classified as friend, neutral or threat.

⚠️ Never use alarm or mobbing against unfamiliar crows. A crow that classifies you as a "threat" shares that information with its flock. This negative association can persist for months to years and is very difficult to reverse.

Exception: Alarm can be useful if you want to study reaction patterns — but only with crows that already know you well and can see that it is you playing.

🗺️ Regional dialects

Hooded crow (Corvus cornix) vocalisations show measurable acoustic differences between populations. Studies across Scandinavia, Central Europe and the Mediterranean have documented systematic variations in fundamental frequency, call duration and modulation patterns.

Why this matters to you: A crow in your region may not respond appropriately to a recording made in another country. The app includes recordings from xeno-canto — note the recording's country of origin for each XC sound.

Your role: Every recording you make and tag with a location contributes to mapping regional dialects. Share data via the JSON export.

Tip: Always record the crow's response immediately after playing a sound. Comparing the sound you played with the crow's reply is the core of dialect research.

👤 Facial recognition

Research at the University of Washington (Marzluff et al., 2010) showed that crows (Corvus brachyrhynchos, likely applicable to C. cornix as well) are capable of individual facial recognition in humans.

The experiment: Crows were trapped by researchers wearing a specific mask. Afterwards, crows reacted aggressively specifically towards that mask — not others. The reaction also spread to crows that were not present during the trapping.

Memory: Negative associations were still observed 5 years later. Positive associations appear to build more slowly but are equally lasting.

Practical conclusion: Crows in your area recognise your face. Always wear similar clothing during contact sessions to reduce confusion. Hats and glasses can interfere with recognition.

🔗 External resources
🌿 Artportalen — Swedish species observation database. Report your crow observations here.
🐦 Merlin Bird ID — Cornell Lab AI bird identification. Great for verifying species in the field.
🎵 Xeno-canto — Crowdsourced bird sound library. Source of XC recordings in this app.
📚 References
Marzluff, J.M. et al. (2010). Lasting recognition of threatening people by wild American crows. Animal Behaviour, 79(3), 699–707.
Pendergraft, L.T. & Marzluff, J.M. (2019). Crow vocalizations: complexity and context. Behavioural Processes, 163, 78–89.
Nieder, A. et al. (2024). Crows count before they vocalize. Science, 383, 1058–1061.
Clayton, N.S. & Dickinson, A. (1998). Episodic-like memory during cache recovery by scrub jays. Nature, 395, 272–274.
Emery, N.J. & Clayton, N.S. (2004). The mentality of crows. Science, 306, 1903–1907.
Cornell Lab of Ornithology (2012). Crow behavior and vocal communication. Birds of North America Online.
xeno-canto Foundation (2024). Corvus cornix recordings. xeno-canto.org. CC BY-NC-SA 4.0.
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